Jughead

Hi has nothing to do with your torque converter it is yourvalve body it needs to be taken out and new valve put in it i have a 97 and it did the same thing i am also into trans work. If you keep driving it like that you will screw the tranny and the torque converter. The valve body can be taken out easy in les than 30 min just need to drop the pan this is not a job you can do cause of the need for the reamer tools and all tranny shops should have them. This is a big cause in most of the ford trannies 5r55e s n etc and if you get it looked after when it starts you will save yourselve the cost of a compleat rebuild in canada here the cost is around 800 to 900 to do the job and dont ever let anybody flush your tranny cause in most cases you will be putting a tranny in the care in a couple of months.

hope this helps